In early spring, chicken infectious rhinitis is more prone to occur.
Release time:
Apr 25,2019
Infectious rhinitis is an acute respiratory infectious disease of chickens caused by Haemophilus paragallinarum. The main manifestations are inflammation of the eyes, nasal cavity and suborbital sinus, facial swelling and running water-like nasal fluid. The disease has a high incidence, rapid spread, often mixed with chronic respiratory disease, colibacillosis. The growth and development of breeding chickens are poor, the laying rate of laying hens decreases by 10-40%, and the economic loss is large.
popular features
1. The natural host of the disease is chickens, chickens of various ages can be infected, but the older the age, the stronger the susceptibility. It mainly occurs in breeding chickens and laying hens. The incidence of laying hens is high, and the symptoms are typical and serious. Chickens are poorly susceptible and rarely develop the disease clinically.
2. Infected chickens are the main source of the disease. Pathogens grow and multiply in the mucous membrane of the nasal cavity and suborbital sinus of infected chickens, and are discharged with nasal fluid to pollute the environment. Healthy chickens can be infected by respiratory tract infections through inhaling droplets and dust containing germs, and also by eating contaminated feed and drinking water.
3. The disease occurs frequently in autumn and winter and early spring. The incubation period is short and the spread is fast. Fowl density is too large, chicken house cold, damp, poor ventilation, vitamin A deficiency, parasitic infection, etc., can promote the occurrence and prevalence of the disease.
4. The incidence of this disease is high and it is easy to relapse. In general, the early mortality rate is low, and the late mortality rate is high. A few strains are highly virulent and can also cause higher mortality during the onset period. Often with chicken infectious laryngotracheitis, Escherichia coli, Staphylococcus, Mycoplasma mixed infection.
clinical symptoms
The incubation period of the disease is 1-4 days. Spread rapidly, 3-5 days can spread to the whole group. The initial symptoms of sick chickens are fever, loss of appetite, and thin nasal juice. After 2-3 days of onset, the viscosity of nasal juice increases, yellow scabs form in the nostrils, purring and strange cough appear, and often head-shaking movements. Part of the chicken head under the wings, the spirit of malaise.
2.1-3 days after the onset of the disease, the lower part of the eye as the center of the face swelling and tears. Facial puffiness, mostly unilateral.
3.3-5 days after the onset of a small number of sick chickens drooping, jaw swelling. Individual cockscomb edema. Laying hens lay eggs decreased, generally by 5-30%. Sick chickens have diarrhea and discharge green feces. Emaciation, hair loss. When mixed with slow breath, E. coli, etc., there will be a higher death rate.
anatomical changes
The nasal cavity and suborbital sinus are filled with watery to grayish white viscous secretions or yellow cheese. Redness and edema of mucosa. The mandible and meat beard are cut with yellowish-white cheese or gum peptone.
2. Laying hens with the onset of follicular deformation.
prevention and control measures
1. Establish a good "biosafety system". When the seasons change, especially in autumn and winter and early spring, while doing a good job of heat preservation, we should also ensure good ventilation in the chicken house.
2. Good immunization, improve the specific resistance of chickens. Anti-rhinitis vaccine is recommended at about 10 weeks of age.
Treatment measures
Treatment should be based on the "early detection, early isolation, early diagnosis, early treatment" of the four early principles.
1. Laying hens can choose drugs without drug residues and with good water solubility.
2. Individual seriously ill chickens can be injected with streptomycin, and 5-100000 units/chickens can be injected according to their body weight. Note that chickens are more sensitive to streptomycin, and overdose can easily cause poisoning and death.
Rhinitis is easy to relapse, interval 3-5 days, repeat a course of treatment. Rhinitis is easy to secondary or concurrent slow call, so in the treatment of rhinitis at the same time to add drugs to prevent slow call.
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